| Autor: |
Xiao-Qing Yang, Bingkun Guo, Jue Liu, Long Wang, Penghao Xiao, Graeme Henkelman, Yuhao Lu, Jong Jan Lee, John B. Goodenough, Jie Song |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of the American Chemical Society. 137(7) |
| ISSN: |
1520-5126 |
| Popis: |
Sodium is globally available, which makes a sodium-ion rechargeable battery preferable to a lithium-ion battery for large-scale storage of electrical energy, provided a host cathode for Na can be found that provides the necessary capacity, voltage, and cycle life at the prescribed charge/discharge rate. Low-cost hexacyanometallates are promising cathodes because of their ease of synthesis and rigid open framework that enables fast Na(+) insertion and extraction. Here we report an intriguing effect of interstitial H2O on the structure and electrochemical properties of sodium manganese(II) hexacyanoferrates(II) with the nominal composition Na2MnFe(CN)6·zH2O (Na2-δMnHFC). The newly discovered dehydrated Na2-δMnHFC phase exhibits superior electrochemical performance compared to other reported Na-ion cathode materials; it delivers at 3.5 V a reversible capacity of 150 mAh g(-1) in a sodium half cell and 140 mAh g(-1) in a full cell with a hard-carbon anode. At a charge/discharge rate of 20 C, the half-cell capacity is 120 mAh g(-1), and at 0.7 C, the cell exhibits 75% capacity retention after 500 cycles. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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